From 7272194ed391f9db8bb320c50d715e7e6bba8ff3 Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Thu, 17 Jan 2013 12:31:06 +0200 Subject: i2c-designware: add minimal support for runtime PM In order to save power the device should be put to low power states whenever it is not being used. We implement this by enabling minimal runtime PM support. There isn't much to do for the device itself as it is disabled once the last transfer is completed but subsystem/domain runtime PM hooks can save more power by power gating the device etc. Signed-off-by: Mika Westerberg Signed-off-by: Wolfram Sang --- drivers/i2c/busses/i2c-designware-platdrv.c | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'drivers/i2c/busses/i2c-designware-platdrv.c') diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c index 343357a2b5b4..d8afc85420be 100644 --- a/drivers/i2c/busses/i2c-designware-platdrv.c +++ b/drivers/i2c/busses/i2c-designware-platdrv.c @@ -37,6 +37,7 @@ #include #include #include +#include #include #include #include "i2c-designware-core.h" @@ -149,6 +150,10 @@ static int dw_i2c_probe(struct platform_device *pdev) } of_i2c_register_devices(adap); + pm_runtime_set_active(&pdev->dev); + pm_runtime_enable(&pdev->dev); + pm_runtime_put(&pdev->dev); + return 0; err_free_irq: @@ -175,6 +180,8 @@ static int dw_i2c_remove(struct platform_device *pdev) struct resource *mem; platform_set_drvdata(pdev, NULL); + pm_runtime_get_sync(&pdev->dev); + i2c_del_adapter(&dev->adapter); put_device(&pdev->dev); @@ -186,6 +193,9 @@ static int dw_i2c_remove(struct platform_device *pdev) free_irq(dev->irq, dev); kfree(dev); + pm_runtime_put(&pdev->dev); + pm_runtime_disable(&pdev->dev); + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); release_mem_region(mem->start, resource_size(mem)); return 0; -- cgit v1.2.3